Sofa



FIG. 1 is a front perspective view of a sofa showing my new design;

FIG. 2 is a front perspective view thereof;

FIG. 3 is a rear perspective view thereof;

FIG. 4 is a right side perspective view thereof and of which a side view taken with respect to the left side would be a mirror image;

FIG. 5 is a top perspective view thereof; and,

FIG. 6 is a bottom perspective view thereof. 

The ornamental design for a sofa, as shown and described. 